Ternary azeotropic compositions

ABSTRACT

Azeotropic or azeotrope-like compositions of effective amounts of 1,1,2,2,3,3,4,4,-octofluorobutane; trans-1,2-dichloroethylene, cis-1,2-dichloroethylene, 1,1-dichloroethane, or 1,3-dichloro-1,2,2,3,3-HCFC-225cb; and an alcohol such as methanol, ethanol, or isopropanol, to form an azeotropic or azeotrope-like composition are disclosed that are useful as cleaning agents, refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.

FIELD OF THE INVENTION

This invention relates to compositions, or mixtures, of fluorinatedhydrocarbons and more specifically to azeotropic or azeotrope-likecompositions comprising effective amounts of1,1,2,2,3,3,4,4-octafluorobutane; trans-1,2-dichloroethylene,cis-1,2-dichloroethylene, 1,1-dichloroethane, or1,3-dichloro-1,2,2,3,3-pentafluoropropane; and an alcohol such asmethanol, ethanol, or isopropanol, to form an azeotropic orazeotrope-like composition. Such compositions are useful as cleaningagents, expansion agents for polyolefins and polyurethanes,refrigerants, aerosol propellants, heat transfer media, gaseousdielectrics, fire extinguishing agents, power cycle working fluids,polymerization media, particulate removal fluids, carrier fluids,buffing abrasive agents, and displacement drying agents.

BACKGROUND OF THE INVENTION

Fluorinated hydrocarbons have many uses, one of which is as a cleaningagent or solvent to clean, for example, electronic circuit boards.Electronic components are soldered to circuit boards by coating theentire circuit side of the board with flux and thereafter passing theflux-coated board over preheaters and through molten solder. The fluxcleans the conductive metal parts and promotes solder fusion, but leaveresidues on the circuit boards that must be removed with a cleaningagent.

Preferably, cleaning agents should have a low boiling point,nonflammability, low toxicity, and high solvency power so that flux andflux-residues can be removed without damaging the substrate beingcleaned. Further, it is desirable that cleaning agents that include afluorinated hydrocarbon be azeotropic or azeotrope-like so that they donot tend to fractionate upon boiling or evaporation. If the cleaningagent were not azeotropic or azeotrope-like, the more volatilecomponents of the cleaning agent would preferentially evaporate, and thecleaning agent could become flammable or could have less-desirablesolvency properties, such as lower rosin flux solvency and lowerinertness toward the electrical components being cleaned. The azeotropicproperty is also desirable in vapor degreasing operations because thecleaning agent is generally redistilled and reused for final rinsecleaning.

Fluorinated hydrocarbons may also be used as refrigerants. Inrefrigeration applications, a refrigerant is often lost during operationthrough leaks in shaft seals, hose connections, solder joints, andbroken lines. In addition, the refrigerant may be released to theatmosphere during maintenance procedures on refrigeration equipment.Accordingly, it is desirable to use a single fluorinated hydrocarbon oran azeotropic or azeotrope-like composition that includes one or morefluorinated hydrocarbons as a refrigerant. Some nonazeotropiccompositions that include one or more fluorinated hydrocarbons may alsobe used as refrigerants, but they have the disadvantage of changingcomposition, or fractionating, when a portion of the refrigerant chargeis leaked or discharged to the atmosphere. If a non-azeotropiccomposition contains a flammable component, the blend could becomeflammable because of such a change in composition. Refrigerant equipmentoperation could also be adversely affected due to the change incomposition and vapor pressure that results from fractionation.

Azeotropic or azeotrope-like compositions of fluorinated hydrocarbonsare also useful as blowing agents in the manufacture of close-cellpolyurethane, phenolic and thermoplastic foams. Insulating foams requireblowing agents not only to foam the polymer, but more importantly toutilize the low vapor thermal conductivity of the blowing agents, whichis an important characteristic for insulation value.

Aerosol products employ both single component fluorinate hydrocarbonsand azeotropic or azeotrope-like compositions of fluorinatedhydrocarbons as propellant vapor pressure attenuators in aerosolsystems. Azeotropic or azeotrope-like compositions, with theirsubstantially constant compositions and vapor pressures, are useful assolvents and propellants in aerosols.

Azeotropic or azeotrope-like compositions that include fluorinatedhydrocarbons are also useful as heat transfer media, gaseousdielectrics, fire extinguishing agents, power cycle working fluids suchas for heat pumps, inert media for polymerization reactions, fluids forremoving particulates from metal surfaces, and as carrier fluids thatmay be used, for example, to place a fine film of lubricant on metalparts.

Azeotropic or azeotrope-like compositions that include fluorinatedhydrocarbons are further useful as buffing abrasive detergents to removebuffing abrasive compounds from polished surfaces such as metal, asdisplacement drying agents for removing water such as from jewelry ormetal parts, as resist-developers in conventional circuit manufacturingtechniques employing chlorine-type developing agents, and as strippersfor photoresists when used with, for example, a chlorohydrocarbon suchas 1,1,1-trichloroethane or trichloroethylene.

Some of the fluorinated hydrocarbons that are currently used in theseapplications have been theoretically linked to depletion of the earth'sozone layer and to global warming. What is needed, therefore, aresubstitutes for fluorinated hydrocarbons that have low ozone depletionpotentials and low global warming potentials.

SUMMARY OF THE INVENTION

The present invention relates to the discovery of azeotropic orazeotrope-like compositions comprising admixtures of effective amountsof 1,1,2,2,3,3,4,4-octafluorobutane; trans-1,2-dichloroethylene,cis-1,2-dichloroethylene, 1,1-dichloroethane, or1,3-dichloro-1,2,2,3,3-pentafluoropropane; and an alcohol such asmethanol, ethanol, or isopropanol, to form an azeotropic orazeotrope-like composition.

DETAILED DESCRIPTION

The compositions of the instant invention are constant boiling,azeotropic or azeotrope-like compositions, or mixtures, comprisingeffective amounts of 1,1,2,2,3,3,4,4-octafluorobutane (HFC-338pcc, orCHF₂ CF₂ CF₂ CHF₂, boiling point=44° C.); trans-1,2-dichloroethylene(CHCl═CHCl, boiling point=48.0° C.), cis-1,2-dichloroethylene(CHCl═CHCl, boiling point=60.1° C.), 1,1-dichloroethane (CHCl₂ CH₃,boiling point=57.3° C.), or 1,3-dichloro-1,2,2,3,3-pentafluoropropane(HCFC-225cb, or CHClFCF₂ CClF₂, boiling point=52° C.); and an alcoholsuch as methanol (CH₃ OH, boiling point=64.6° C.), ethanol (CH₃ --CH₂--OH, boiling point=78.4° C.), or isopropanol ((CH₃)₂ --CHOH, boilingpoint=82.3° C.), to form an azeotropic or azeotrope-like composition.

Effective amounts of 1,1,2,2,3,3,4,4-octafluorobutane;trans-1,2-dichloroethylene, cis-1,2-dichloroethylene,1,1-dichloroethane, or 1,3-dichloro-1,2,2,3,3-pentafluoropropane; and analcohol such as methanol, ethanol, or isopropanol, to form an azeotropicor azeotrope-like composition, when defined in terms of weight percentof the components at a specific pressure or temperature, include thefollowing.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338 pcc, trans-1,2-dichloroethylene and methanolcomprise about 56.8 to 69.8 weight percent HFC-338 pcc, about 27.9 to39.9 weight percent trans-1,2-dichloroethylene, and about 1.8 to 3.8weight percent methanol. These compositions boil at about 34.7°+/-0.4°C., at substantially atmospheric pressure. A preferred compositioncomprises about 62.0 to 64.6 weight percent HFC-338 pcc, 32.7 to 35.1weight percent trans-1,2-dichloroethylene, and about 2.6 to 3.0 weightpercent methanol. A more preferred composition is the azeotrope, whichcomprises about 63.3 weight percent HFC-338 pcc, about 33.9 weightpercent trans-1,2-dichloro-ethylene, and about 2.8 weight percentmethanol, and which boils at about 34.7° C., at substantiallyatmospheric pressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338 pcc, trans-1,2-dichloroethylene and ethanolcomprise about 63.2 to 69.2 weight percent HFC-338 pcc, about 30.0 to36.0 weight percent trans-1,2-dichloroethylene, and about 0.2 to 1.4weight percent ethanol. These compositions boil at about 36.1°+/-0.3°C., at substantially atmospheric pressure. A preferred compositioncomprises about 65.9 to 66.5 weight percent HFC-338 pcc, 32.8 to 33.2weight percent trans-1,2-dichloroethylene, and about 0.6 to 1.0 weightpercent ethanol. A more preferred composition is the azeotrope, whichcomprises about 66.2 weight percent HFC-338 pcc, about 33.1 weightpercent trans-1,2-dichloroethylene, and about 0.7 weight percentethanol, and which boils at about 36.1° C., at substantially atmosphericpressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338 pcc, trans-1,2-dichloroethylene and isopropanolcomprise about 60.0 to 68.0 weight percent HFC-338 pcc, about 31.7 to39.7 weight percent trans-1,2-dichloroethylene, and about 0.1 to 0.5weight percent isopropanol. These compositions boil at about36.0°+/-0.3° C., at substantially atmospheric pressure. A preferredcomposition comprises about 63.9 to 64.1 weight percent HFC-338 pcc,35.5 to 35.9 weight percent trans-1,2-dichloroethylene, and about 0.2 to0.4 weight percent isopropanol. A more preferred composition is theazeotrope, which comprises about 64.0 weight percent HFC-338 pcc, about35.7 weight percent trans-1,2-dichloroethylene, and about 0.3 weightpercent isopropanol, and which boils at about 36.0° C., at substantiallyatmospheric pressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338 pcc, cis-1,2-dichloroethylene and methanolcomprise about 78.2 to 84.2 weight percent HFC-338 pcc, about 12.3 to18.3 weight percent cis-1,2-dichloroethylene, and about 2.5 to 4.5weight percent methanol. These compositions boil at about 40.2°+/-0.3°C., at substantially atmospheric pressure. A preferred compositioncomprises about 80.9 to 81.5 weight percent HFC-338pcc, 15.0 to 15.6weight percent cis-1,2-dichloroethylene, and about 3.4 to 3.6 weightpercent methanol. A more preferred composition is the azeotrope, whichcomprises about 81.2 weight percent HFC-338pcc, about 15.3 weightpercent cis-1,2-dichloroethylene, and about 3.5 weight percent methanol,and which boils at about 40.2° C., at substantially atmosphericpressure.

Substantially constant-boiling, azeotropic or azetrope-like compositionsof HFC-338pcc, cis-1,2-dichloroethylene and ethanol comprise about 72.4to 85.4 weight percent HFC-338pcc, about 12.7 to 26.7 weight percentcis-1,2-dichloroethylene, and about 0.4 to 2.4 weight percent ethanol.These compositions boil at about 42.5°+/-0.3° C., at substantiallyatmospheric pressure. A preferred composition comprises about 77.6 to80.2 weight percent HFC-338pcc, 18.3 to 21.1 weight percentcis-1,2-dichloroethylene, and about 1.2 to 1.6 weight percent ethanol. Amore preferred composition is the azeotrope, which comprises about 78.9weight percent HFC-338pcc, about 19.7 weight percentcis-1,2-dichloroethylene, and about 1.4 weight percent ethanol, andwhich boils at about 42.5° C., at substantially atmospheric pressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338pcc, cis-1,2-dichloroethylene and isopropanolcomprise about 75.0 to 86.0 weight percent HFC-338pcc, about 12.5 to23.5 weight percent cis-1,2-dichloroethylene, and about 0.1 to 1.0weight percent isopropanol. These compositions boil at about42.2°+/-0.2° C., at substantially atmospheric pressure. A preferredcomposition comprises about 75.0 to 86.0 weight percent HFC-338pcc, 12.5to 23.5 weight percent cis-1,2-dichloroethylene, and about 0.1 to 1.0weight percent isopropanol. A more preferred composition is theazeotrope, which comprises about 79.0 to 83.0 weight percent HFC-338pcc,about 17.5 to 19.5 weight percent cis-1,2-dichloroethylene, and about0.2 to 0.4 weight percent isopropanol, and which boils at about 42.2°C., at substantially atmospheric pressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338pcc, 1,1-dichloroethane and methanol compriseabout 76.6 to 84.6 weight percent HFC-338pcc, about 14.0 to 18.0 weightpercent 1,1-dichloroethane, and about 1.4 to 5.4 weight percentmethanol. These compositions boil at about 40.3°+/-0.5° C., atsubstantially atmospheric pressure. A preferred composition comprisesabout 80.2 to 81.0 weight percent HFC-338pcc, 15.8 to 16.2 weightpercent 1,1-dichloroethane, and about 3.2 to 3.6 weight percentmethanol. A more preferred composition is the azeotrope, which comprisesabout 80.6 weight percent HFC-338pcc, about 16.0 weight percent1,1-dichloroethane, and about 3.4 weight percent methanol, and whichboils at about 40.3° C., at substantially atmospheric pressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338pcc, 1,1-dichloroethane and ethanol compriseabout 73.5 to 82.5 weight percent HFC-338pcc, about 17.1 to 24.1 weightpercent 1,1-dichloroethane, and about 0.4 to 2.4 weight percent ethanol.These compositions boil at about 39.6°+/-0.5° C., at substantiallyatmospheric pressure. A preferred composition comprises about 77.1 to78.9 weight percent HFC-338pcc, 19.9 to 21.3 weight percent1,1-dichloroethane, and about 1.32 to 1.6 weight percent ethanol. A morepreferred composition is the azeotrope, which comprises about 78.0weight percent HFC-338pcc, about 20.6 weight percent 1,1-dichloroethane,and about 1.4 weight percent ethanol, and which boils at about 39.6° C.,at substantially atmospheric pressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338pcc, 1,1-dichloroetane and isopropanol compriseabout 77.0 to 87.0 weight percent HFC-338pcc, about 12.6 to 22.6 weightpercent 1,1-dichloroethane, and about 0.1 to 1.0 weight percentisopropanol. These compositions boil at about 42.6°+/-0.5° C., atsubstantially atmospheric pressure. A preferred composition comprisesabout 81.9 to 82.1 weight percent HFC-338pcc, 17.5 to 17.7 weightpercent 1,1-dichloroethane, and about 0.2 to 0.6 weight percentisopropanol. A more preferred composition is the azeotrope, whichcomprises about 82.0 weight percent HFC-338pcc, about 17.6 weightpercent 1,1-dichloroethane, and about 0.4 weight percent isopropanol,and which boils at about 42.6° C., at substantially atmosphericpressure.

Substantially constant-boiling, azeotropic or azeotrope-likecompositions of HFC-338pcc, HCFC-225cb and methanol comprise about 71.3to 91.3 weight percent HFC-338pcc, about 10.2 to 19.8 weight percentHCFC-225cb, and about 2.7 to 4.7 weight percent methanol. Thesecompositions boil at about 42.0°+/-0.3° C., at substantially atmosphericpressure. A preferred composition comprises about 76.3 to 86.3 weightpercent HFC-338pcc, 10.2 to 19.8 weight percent HCFC-225cb, and about3.2 to 4.2 weight percent methanol. A more preferred composition is theazeotrope, which comprises about 81.3 weight percent HFC-338pcc, about15.0 weight percent HCFC-225cb, and about 3.7 weight percent methanol,and which boils at about 42.0° C., at substantially atmosphericpressure.

For purposes of this invention, "effective amount" is defined as theamount of each component of the inventive compositions which, whencombined, results in the formation of an azeotropic or azeotrope-likecomposition. This definition includes the amounts of each component,which amounts may vary depending on the pressure applied to thecomposition so long as the azeotropic or azeotrope-like compositionscontinue to exist at the different pressures, but with possibledifferent boiling points.

Therefore, effective amount includes the amounts, such as may beexpressed in weight percentages, of each component of the compositionsof the instant invention which form azeotropic or azeotrope-likecompositions at pressures other than the pressure described herein.

By "azeotropic or azeotrope-like" composition is meant a constantboiling, or substantially constant boiling, liquid admixture of two ormore substances that behaves as a single substance. One way tocharacterize an azeotropic or azeotrope-like composition is that thevapor produced by partial evaporation or distillation of the liquid hassubstantially the same composition as the liquid from which it wasevaporated or distilled, that is, the admixture distills/refluxeswithout substantial composition change. Constant boiling orsubstantially constant boiling compositions, which are characterized asazeotropic or azeotrope-like, exhibit either a maximum or minimumboiling point, as compared with that of the nonazeotropic mixtures ofthe same components.

For the purposes of this discussion, azeotropic or constant-boiling isintended to mean also essentially azeotropic or essentially-constantboiling. In other words, included within the meaning of these terms arenot only the true azeotropes described above, but also othercompositions containing the same components in different proportions,which are true azeotropes at other temperatures and pressures, as wellas those equivalent compositions which are part of the same azeotropicsystem and are azeotrope-like in their properties. As is well recognizedin this art, there is a range of compositions which contain the samecomponents as the azeotrope, which will not only exhibit essentiallyequivalent properties for refrigeration and other applications, butwhich will also exhibit essentially equivalent properties to the trueazeotropic composition in terms of constant boiling characteristics ortendency not to segregate or fractionate on boiling.

It is possible to characterize, in effect, a constant boiling admixturewhich may appear under many guises, depending upon the conditionschosen, by any of several criteria:

The composition can be defined as an azeotrope of A, B, C (and D . . . )since the very term "azeotrope" is at once both definitive andlimitative, and requires that effective amounts of A, B, C (and D . . .) for this unique composition of matter which is a constant boilingcomposition.

It is well known by those skilled in the art, that, at differentpressures, the composition of a given azeotrope will vary at least tosome degree, and changes in pressure will also change, at least to somedegree, the boiling point temperature. Thus, and azeotrope of A, B, C(and D . . . ) represents a unique type of relationship but with avariable composition which depends on temperature and/or pressure.Therefore, compositional ranges, rather than fixed compositions, areoften used to define azeotropes.

The composition can be defined as a particular weight percentrelationship or mole percent relationship of A, B, C (and D . . . ),while recognizing that such specific values point out only oneparticular relationship and that in actuality, a series of suchrelationships, represented by A, B, C (and D . . . ) actually exist fora given azeotrope, varied by the influence of pressure.

An azeotrope of A, B, C (and D . . . ) can be characterized by definingthe compositions as an azeotrope characterized by a boiling point at agiven pressure, thus giving identifying characteristics without undulylimiting the scope of the invention by a specific numerical composition,which is limited by and is only as accurate as the analytical equipmentavailable.

The following ternary compositions are characterized as azeotropic orazeotrope-like in that mixtures within this range exhibit asubstantially constant boiling point at substantially atmosphericpressure. Being substantially constant boiling, the mixtures do not tendto fractionate to any great extent upon evaporation. After evaporation,only a small difference exists between the composition of the vapor andthe composition of the initial liquid phase. This difference is suchthat the compositions of the vapor and liquid phases are consideredsubstantially identical. Accordingly, any compositions within this rangeexhibit properties which are characteristic of a true ternary azeotrope.

1. About 56.8 to 69.8 weight percent HFC-338pcc, about 27.9 to 39.9weight percent trans-1,2-dichloroethylene, and about 1.8 to 3.8 weightpercent methanol;

2. About 63.2 to 69.2 weight percent HFC-338pcc, about 30.0 to 36.0weight percent trans-1,2-dichloroethylene, and about 0.2 to 1.4 weightpercent ethanol;

3. About 60.0 to 68.0 weight percent HFC-338pcc, about 31.7 to 39.7weight percent trans-1,2-dichloroethylene, and about 0.1 to 0.5 weightpercent isopropanol;

4. About 78.2 to 84.2 weight percent HFC-338pcc, about 12.3 to 18.3weight percent cis-1,2-dichloroethylene, and about 2.5 to 4.5 weightpercent methanol;

5. About 72.4 to 85.4 weight percent HFC-338pcc, about 12.7 to 26.7weight percent cis-1,2-dichloroethylene, and about 0.4 to 2.4 weightpercent ethanol;

6. About 75.0 to 86.0 weight percent HFC-338pcc, about 12.5 to 23.5weight percent cis-1,2-dichloroethylene, and about 0.1 to 1.0 weightpercent isopropanol;

7. About 76.6 to 84.6 weight percent HFC-338pcc, about 14.0 to 18.0weight percent 1,1-dichloroethane, and about 1.4 to 5.4 weight percentmethanol;

8. About 73.5 to 82.5 weight percent HFC-338pcc, about 17.1 to 24.1weight percent 1,1-dichloroethane, and about 0.4 to 2.4 weight percentethanol;

9. About 77.0 to 87.0 weight percent HFC-338pcc, about 12.6 to 22.6weight percent 1,1-dichloroethane, and about 0.1 to 1.0 weight percentisopropanol; and

10. About 71.3 to 91.3 weight percent HFC-338pcc, about 10.2 to 19.8weight percent HCFC-225cb, and about 2.7 to 4.7 weight percent methanol.

The following ternary compositions have been established, within theaccuracy of the fractional distillation method, as true ternaryazeotropes at substantially atmospheric pressure.

1. About 63.3 weight percent HFC-338pcc, about 33.9 weight percenttrans-1,2-dichloroethylene, and about 2.8 weight percent methanol;

2. About 66.2 weight percent HFC-338pcc, about 33.1 weight percenttrans-1,2-dichloroethylene, and about 0.7 weight percent ethanol;

3. About 64.0 weight percent HFC-338pcc, about 35.7 weight percenttrans-1,2-dichloroethylene, and about 0.3 weight percent isopropanol;

4. About 81.2 weight percent HFC-338pcc, about 15.3 weight percentcis-1,2-dichloroethylene, and about 3.5 weight percent methanol;

5. About 78.9 weight percent HFC-338pcc, about 19.7 weight percentcis-1,2-dichloroethylene, and about 1.4 weight percent ethanol;

6. About weight percent HFC-338pcc, about weight percentcis-1,2-dichloroethylene, and about weight percent isopropanol;

7. About 80.6 weight percent HFC-338pcc, about 16.0 weight percent1,1-dichloroethane, and about 3.4 weight percent methanol;

8. About 78.0 weight percent HFC-338pcc, about 20.6 weight percent1,1-dichloroethane, and about 1.4 weight percent ethanol;

9. About 82.0 weight percent HFC-338pcc, about 17.6 weight percent1,1-dichloroethane, and about 0.4 weight percent isopropanol; and

10. About 81.3 weight percent HFC-338pcc, about 15.0 weight percentHCFC-225cb, and about 3.7 weight percent methanol.

The aforestated azeotropes have low ozone-depletion potentials and areexpected to decompose almost completely, prior to reaching thestratosphere.

The azeotropic or azeotrope-like compositions of the instant inventionpermit easy recovery and reuse of the solvent from vapor defluxing anddegreasing operations because of their azeotropic natures. As anexample, the azeotropic mixtures of this invention can be used incleaning processes such as described in U.S. Pat. No. 3,881,949, or as abuffing abrasive detergent.

In addition, the mixtures are useful as resist developers, wherechlorine-type developers would be used, and as resist stripping agentswith the addition of appropriate halocarbons.

Another aspect of the invention is a refrigeration method whichcomprises condensing a refrigerant composition of the invention andthereafter evaporating it in the vicinity of a body to be cooled.Similarly, still another aspect of the invention is a method for heatingwhich comprises condensing the invention refrigerant in the vicinity ofa body to be headed and thereafter evaporating the refrigerant.

A further aspect of the invention includes aerosol compositionscomprising an active agent and a propellant, wherein the propellant isan azeotropic mixture of the invention; and the production of thesecompositions by combining said ingredients. The invention furthercomprises cleaning solvent compositions comprising the azeotropicmixtures of the invention.

The azeotropic or azeotrope-like compositions of the instant inventioncan be prepared by any convenient method including mixing or combiningthe desired component amounts. A preferred method is to weigh thedesired component amounts and thereafter combine them in an appropriatecontainer.

Without further elaboration, it is believed that one skilled in the artcan, using the preceding description, utilize the present invention toits fullest extent. The following preferred specific embodiments are,therefore, to be construed as merely illustrative, and not limitative ofthe remainder of the disclosure in any way whatsoever.

In the foregoing and in the following examples, all temperatures are setforth uncorrected in degrees Celsius and unless otherwise indicated, allparts and percentages are by weight.

EXAMPLE 1

A solution containing 67.0 weight percent HFC-338pcc, 31.0 weightpercent trans-1,2-dichloroethylene and 2.0 weight percent methanol wasprepared in a suitable container and mixed thoroughly.

The solution was distilled in a twenty-five plate Oldershaw distillationcolumn using a 15:1 reflux to take-off ratio. Head and pot temperatureswere read directly to 0.1° C. The pressure was at 772.5 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 1.

                                      TABLE 1                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            TRANS MEOH                                   __________________________________________________________________________    1    35.1 34.5  12.3     63.7    33.6  2.7                                    2    35.4 34.7  20.4     63.3    34.0  2.8                                    3    35.5 34.7  29.2     62.7    34.5  2.8                                    4    35.8 34.7  38.0     63.6    33.7  2.8                                    5    36.2 34.7  45.7     63.4    33.9  2.7                                    6    36.3 34.8  60.7     65.2    34.0  0.9                                    7    36.4 36.1  63.0     66.6    33.3  0.1                                    HEEL --   --    89.6     62.1    37.9  0.0                                    __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, trans-1,2-dichloroethylene and methanol has thefollowing characteristics at atmospheric pressure (99 percent confidencelimits):

    ______________________________________                                        HFC-338pcc =         63.3 +/- 1.3 wt. %                                       trans-1,2-dichloroethylene =                                                                       33.9 +/- 1.2 wt. %                                       methanol =            2.8 +/- 0.2 wt. %                                       Boiling point, °C. =                                                                        34.7 +/- 0.4                                             ______________________________________                                    

EXAMPLE 2

Several single sided circuit boards were coated with activated rosinflux and soldered by passing the boards over a preheater to obtain topside board temperatures of approximately 200° F., and then through 500°F. molten solder. The soldered boards were defluxed separately with theazeotropic mixtures cited in Example 1 above by suspending a circuitboard for three minutes in a boiling sump that contained the azeotropicmixture, then suspending the board for one minute in a rinse sump thatcontained the same azeotropic mixture, and then suspending the board forone minute in the solvent vapor above the boiling sump. The boardscleaned in each azeotropic mixture had no visible residue remainingthereon.

EXAMPLE 3

A solution containing 64.1 weight percent HFC-338pcc, 33.4 weightpercent trans-1,2-dichloroethylene and 3.0 weight percent ethanol wasprepared in a suitable container and mixed thoroughly.

The solution was distilled in a five plate Oldershaw distillation columnusing a 5:1 reflux to take-off ratio. Head and pot temperatures wereread directly to 0.1° C. The pressure was at 772.1 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 2.

                                      TABLE 2                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            TRANS ETOH                                   __________________________________________________________________________    1    37.2 36.1  16.3     66.3    33.1  0.6                                    2    36.8 36.1  26.0     66.3    33.1  0.7                                    3    37.0 36.1  35.2     66.3    33.1  0.7                                    4    37.1 36.1  44.6     66.3    33.1  0.7                                    5    37.3 36.1  54.4     66.2    33.1  0.7                                    6    37.7 36.1  65.9     66.2    33.1  0.8                                    7    45.2 36.1  78.6     66.1    33.2  0.8                                    HEEL --   --    90.2     55.7    36.3  8.1                                    __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, trans-1,2-dichloroethylene and ethanol has thefollowing characteristics at atmospheric pressure (99 percent confidencelimits):

    ______________________________________                                        HFC-338pcc =         66.2 +/- 0.3 wt. %                                       trans-1,2-dichloroethylene =                                                                       33.1 +/- 0.1 wt. %                                       ethanol =             0.7 +/- 0.2 wt. %                                       Boiling point, °C. =                                                                        36.1 +/- 0.1                                             ______________________________________                                    

EXAMPLE 4

A solution containing 66.2 weight percent HFC-338ppc, 32.0 weightpercent trans-1,2-dichloroethylene and 2.0 weight percent isopropanolwas prepared in a suitable container and mixed thoroughly.

The solution was distilled in a five plate Oldershaw distillation columnusing a 5:1 reflux to take-off ratio. Head and pot temperatures wereread directly to 0.1° C. The pressure was at 767.8 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 3.

                                      TABLE 3                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            TRANS IPA                                    __________________________________________________________________________    1    36.5 36.0  16.3     64.2    35.7  0.1                                    2    36.8 36.0  26.0     64.1    35.7  0.2                                    3    37.0 36.0  35.2     64.1    35.7  0.2                                    4    37.0 36.0  44.6     64.1    35.7  0.3                                    5    37.8 36.0  54.4     64.1    35.6  0.3                                    6    40.0 36.1  65.9     64.0    35.6  0.5                                    7    58.9 36.6  78.6     64.0    35.3  0.8                                    HEEL --   --    90.2     49.6    22.5  27.9                                   __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338ppc, trans-1,2-dichloroethylene and isopropanol hasthe following characteristics at atmospheric pressure (99 percentconfidence limits):

    ______________________________________                                        HFC-338pcc =         64.0 +/- 0.0 wt. %                                       trans-1,2-dichloroethylene =                                                                       35.7 +/- 0.2 wt. %                                       isopropanol =         0.3 +/- 0.2 wt. %                                       Boiling point, °C. =                                                                        36.0 +/- 0.1                                             ______________________________________                                    

EXAMPLE 5

A solution containing 78.6 weight percent HFC-338pcc, 18.3 weightpercent cis-1,2-dichloroethylene and 3.1 weight percent methanol wasprepared in a suitable container and mixed thoroughly.

The solution was distilled in a twenty-five plate Oldershaw distillationcolumn using a 15:1 reflux to take-off ratio. Head and pot temperatureswere read directly to 0.1° C. The pressure was at 768.2 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 4.

                                      TABLE 4                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            CIS   MEOH                                   __________________________________________________________________________    1    41.5 40.1  10.8     80.7    15.9  3.4                                    2    41.5 40.2  23.9     81.1    15.4  3.5                                    3    41.6 40.2  31.9     81.3    15.2  3.5                                    4    42.3 40.2  44.9     81.3    15.2  3.5                                    5    44.3 40.2  54.8     81.2    15.3  3.5                                    6    54.0 40.2  67.8     81.2    15.3  3.5                                    7    100.0                                                                              40.2  72.8     81.3    15.2  3.5                                    HEEL --   --    92.8     76.8    23.2  0.0                                    __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, cis-1,2-dichloroethylene and methanol has thefollowing characteristics at atmospheric pressure (99 percent confidencelimits):

    ______________________________________                                        HFC-338pcc =         81.2 +/- 0.3 wt. %                                       cis-1,2-dichloroethylene =                                                                         15.3 +/- 0.3 wt. %                                       methanol =            3.5 +/- 0.1 wt. %                                       Boiling point, °C. =                                                                        40.2 +/- 0.1                                             ______________________________________                                    

EXAMPLE 6

A solution containing 76.1 weight percent HFC-338pcc, 21.6 weightpercent cis-1,2-dichloroethylene and 2.3 weight percent ethanol wasprepared in a suitable container and mixed thoroughly.

The solution was distilled in a five plate Oldershaw distillation columnusing a 5:1 reflux to take-off ratio. Head and pot temperatures wereread directly to 0.1° C. The pressure was at 773.8 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 5.

                                      TABLE 5                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            CIS   ETOH                                   __________________________________________________________________________    1    43.2 42.3  12.2     78.1    20.6  1.3                                    2    43.2 42.4  24.2     78.9    19.8  1.3                                    3    43.5 42.5  47.4     79.2    19.5  1.4                                    4    43.8 42.5  56.9     79.1    19.4  1.4                                    5    44.4 42.6  67.7     79.1    19.5  1.4                                    6    46.3 42.6  76.4     79.0    19.6  1.4                                    7    79.4 52.5  89.6     76.8    21.1  2.1                                    HEEL --   --    93.5     50.0    37.1  13.0                                   __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFO-338pcc, cis-1,2-dichloroethylene and ethanol has thefollowing characteristics at atmospheric pressure (99 percent confidencelimits):

    ______________________________________                                        HFC-338pcc =         78.9 +/- 1.3 wt. %                                       cis-1,2-dichloroethylene =                                                                         19.7 +/- 1.4 wt. %                                       ethanol =             1.4 +/- 0.2 wt. %                                       Boiling point, °C. =                                                                        42.5 +/- 0.3                                             ______________________________________                                    

EXAMPLE 7

A solution containing 75.9 weight percent HFC-338pcc, 21.7 weightpercent cis-1,2-dichloroethylene and 2.4 weight percent isopropanol wasprepared in a suitable container and mixed thoroughly.

The solution was distilled in a five plate Oldershaw distillation columnusing a 2:1 reflux to take-off ratio. Head and pot temperatures wereread directly to 0.1° C. The pressure was at 759.3 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 6.

                                      TABLE 6                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            CIS   IPA                                    __________________________________________________________________________    1    42.0 44.0  12.9     81.6    18.2  0.3                                    2    42.1 44.4  24.1     81.3    18.4  0.3                                    3    42.1 44.7  42.2     81.5    18.2  0.4                                    4    42.2 45.4  52.9     81.0    18.7  0.4                                    5    42.2 46.5  64.3     80.9    18.7  0.4                                    6    42.3 52.2  77.5     80.6    19.0  0.5                                    7    45.1 76.9  81.0     79.0    20.4  0.6                                    HEEL --   --    88.9     30.6    45.4  24.0                                   __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, cis-1,2-dichloroethylene and isopropanol hasthe following characteristics at atmospheric pressure (99 percentconfidence limits):

    ______________________________________                                        HFC-338pcc =         81.0 +/- 1.2 wt. %                                       cis-1,2-dichloroethylene =                                                                         18.6 +/- 1.0 wt. %                                       isopropanol =         0.4 +/- 0.2 wt. %                                       Boiling point, °C. =                                                                        42.2 +/- 0.2                                             ______________________________________                                    

EXAMPLE 8

A solution containing 75.3 weight percent HFC-338pcc, 21.9 weightpercent 1,1-dichloroethane and 2.8 weight percent methanol was preparedin a suitable container and mixed thoroughly.

The solution was distilled in a twenty-five plate Oldershaw distillationcolumn using a 15:1 reflux to take-off ratio. Head and pot temperatureswere read directly to 0.1° C. The pressure was at 768.1 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 7.

                                      TABLE 7                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            11DCE MEOH                                   __________________________________________________________________________    1    42.4 40.2  11.9     80.6    16.1  3.3                                    2    42.9 40.3  22.4     80.5    16.1  3.4                                    3    43.4 40.3  31.7     80.6    16.1  3.4                                    4    44.9 40.3  41.7     80.6    16.0  3.4                                    5    46.3 40.3  51.4     80.7    16.0  3.4                                    6    99.0 41.9  59.0     80.6    16.0  3.3                                    7    --   --    66.3     81.6    16.4  2.1                                    HEEL --   --    86.2     73.1    26.8  0.1                                    __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions at the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, 1,1-dichloroethane and methanol has thefollowing characteristics at atmospheric pressure (99 percent confidencelimits):

    ______________________________________                                        HFC-338pcc =         80.6 +/- 0.3 wt. %                                       1,1-dichloroethane = 16.0 +/- 0.2 wt. %                                       methanol =            3.4 +/- 0.1 wt. %                                       Boiling point, °C. =                                                                        40.3 +/- 0.0                                             ______________________________________                                    

EXAMPLE 9

A solution containing 78.3 weight percent HFC-338pcc, 18.8 weightpercent 1,1-dichloroethane and 2.9 weight percent ethanol was preparedin a suitable container and mixed thoroughly.

The solution was distilled in a five plate Oldershaw distillation columnusing a 5:1 reflux to take-off ratio. Head and pot temperatures wereread directly to 0.1° C. The pressure was at 768.9 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 8.

                                      TABLE 8                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            11DCE ETOH                                   __________________________________________________________________________    1    35.8 38.0   8.6     78.4    20.3  1.3                                    2    35.8 38.4  27.6     78.1    20.5  1.4                                    3    35.8 39.0  42.7     78.2    20.4  1.4                                    4    35.8 40.1  54.8     78.0    20.6  1.4                                    5    35.8 42.7  68.5     77.7    20.9  1.5                                    6    35.8 50.6  80.8     77.0    21.5  1.5                                    7    35.9 78.0  90.3     71.2    26.3  2.5                                    HEEL --   --    94.3     38.1    39.7  22.2                                   __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, 1,1-dichloroethane and ethanol has thefollowing characteristics at atmospheric pressure (99 percent confidencelimits):

    ______________________________________                                        HFC-338pcc =         78.0 +/- 0.9 wt. %                                       1,1-dichloroethane = 20.6 +/- 0.7 wt. %                                       ethanol =             1.4 +/- 0.2 wt. %                                       Boiling point, °C. =                                                                        39.6 +/- 6.3                                             ______________________________________                                    

EXAMPLE 10

A solution containing 77.8 weight percent HFC-338pcc, 19.4 weightpercent 1,1-dichloroethane and 3.0 weight percent isopropanol wasprepared in a suitable container and mixed thoroughly.

The solution was distilled in a five plate Oldershaw distillation columnusing a 5:1 reflux to take-off ratio. Head and pot temperatures wereread directly to 0.1° C. The pressure was at 764.0 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 9.

                                      TABLE 9                                     __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            11DCE IPA                                    __________________________________________________________________________    1    44.7 42.6  15.2     79.9    19.8  0.3                                    2    45.0 42.6  24.4     82.3    17.4  0.3                                    3    45.5 42.6  35.2     82.0    17.6  0.4                                    4    45.8 42.6  46.7     82.0    17.6  0.4                                    5    46.7 42.6  57.5     81.7    17.9  0.4                                    6    47.7 42.7  66.7     81.0    18.5  0.5                                    7    42.7 51.5  74.5     80.6    18.9  2.1                                    HEEL --   --    82.3     63.5    25.1  11.4                                   __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, 1,1-dichloroethane and isopropanol has thefollowing characteristics at atmospheric pressure (99 percent confidencelimits):

    ______________________________________                                        HFC-338pcc =         82.0 +/- 1.0 wt. %                                       1,1-dichloroethane = 17.6 +/- 0.8 wt. %                                       isopropanol =         0.4 +/- 0.2 wt. %                                       Boiling point, °C. =                                                                        42.6 +/- 0.1                                             ______________________________________                                    

EXAMPLE 11

A solution containing 77.4 weight percent HFC-338pcc, 19.6 weightpercent HCFC-225cb and 3.0 weight percent methanol was prepared in asuitable container and mixed thoroughly.

The solution was distilled in a five plate Oldershaw distillation columnusing a 2:1 reflux to take-off ratio. Head and pot temperatures wereread directly to 0.1° C. The pressure was at 771.3 mmHg. Distillatecompositions were determined by gas chromatography. Results obtained aresummarized in Table 10.

                                      TABLE 10                                    __________________________________________________________________________                    WT. %                                                         TEMPERATURE     DISTILLED                                                     °C.      OR       WEIGHT PERCENTAGES                                   CUTS POT  HEAD  RECOVERED                                                                              HFC-338pcc                                                                            225cb MEOH                                   __________________________________________________________________________    1    42.8 41.9  12.0     82.9    13.7  3.5                                    2    42.9 42.0  22.7     82.0    14.3  3.8                                    3    43.1 42.0  33.9     82.3    14.0  3.7                                    4    43.4 42.1  46.9     80.5    15.8  3.8                                    5    44.4 42.1  58.0     79.1    17.1  3.8                                    6    47.2 43.0  71.8     77.4    19.1  3.5                                    7    54.4 45.6  83.3     75.1    23.4  1.5                                    HEEL --   --    93.6     59.6    40.3  0.2                                    __________________________________________________________________________

Analysis of the above data indicates very small differences between headtemperatures and distillate compositions as the distillation progressed.A statistical analysis of the data indicates that the true ternaryazeotrope of HFC-338pcc, HCFC-225cb and methanol has the followingcharacteristics at atmospheric pressure (99 percent confidence limits):

    ______________________________________                                        HFC-338pcc =         81.3 +/- 5.1 wt. %                                       HCFC-225cb =         15.0 +/- 4.9 wt. %                                       methanol =            3.7 +/- 0.5 wt. %                                       Boiling point, °C. =                                                                        42.0 +/- 0.3                                             ______________________________________                                    

EXAMPLE 12

Several single sided circuit boards were coated with activated rosinflux and soldered by passing the boards over a preheater, to obtain topside board temperatures of approximately 200° F. (93.3° C.), and thenthrough 500° F. (260° C.) molten solder. The soldered boards weredefluxed separately, with each of the azeotropic mixtures reported inExamples 3 through 11 above, by suspending a circuit board, first, forthree minutes in the boiling sump, which contains the azeotropicmixture, then, for one minute in the rinse sump, which contains the sameazeotropic mixture, and finally, for one minute in the solvent vaporabove the boiling sump. The boards cleaned in each azeotropic mixturehad no visible residue remaining thereon.

ADDITIONAL COMPOUNDS

Other components, such as aliphatic hydrocarbons having a boiling pointof 35°-85° C., hydrofluorocarbonalkanes having a boiling point of35°-85° C., hydrofluoropropanes having a boiling point of between35°-85° C., hydrocarbon esters having a boiling point between 30°-80°C., hydrochlorofluorocarbons having a boiling point between 25°-85° C.,hydrofluorocarbons having a boiling point of 25°-85° C.,hydrochlorocarbons having a boiling point between 35°-85° C.,chlorocarbons and perfluorinated compounds, can be added to theazeotropic or azeotrope-like compositions described above withoutsubstantially changing the properties thereof, including the constantboiling behavior, of the compositions. Examples of such components,which typically do not exceed about 10 weight percent of the totalcomposition, include the following.

    ______________________________________                                                                      boiling point,                                  COMPOUND    FORMULA           °C.                                      ______________________________________                                        HCFC-123    CHCl.sub.2 CF.sub.3                                                                             27                                              HCFC-141b   CFCl.sub.2 CH.sub.3                                                                             32                                              HCFC-225aa  CHF.sub.2 CCl.sub.2 CF.sub.3                                                                    53                                              HCFC-225ca  CHCl.sub.2 CF.sub.2 CF.sub.3                                                                    52                                              HCFC-225cb  CHClFCF.sub.2 CF.sub.2 Cl                                                                       56                                              HCFC-225da  CClF.sub.2 CHClCF.sub.3                                                                         50                                              HFC-43-10mf CF.sub.3 CH.sub.2 CF.sub.2 CF.sub.2 CF.sub.3                                                    52                                              HFC-43-10mcf                                                                              CF.sub.3 CF.sub.2 CH.sub.2 CF.sub.2 CF.sub.3                                                    52                                              FC-C-51-12  cyclo-C.sub.4 F.sub.6 (CF.sub.3).sub.2                                                          45                                                          CH.sub.3 OCF.sub.2 CHFCF.sub.3                                                                  52                                              HFC-C-456myc                                                                              cyclo-CH.sub.2 CH.sub.2 CF.sub.2 CF(CF.sub.3)                     HFC-C-354   cyclo-CF.sub.2 CF.sub.2 CH.sub.2 CH.sub.2                                                       50                                                          C.sub.4 F.sub.9 CH═CH.sub.2                                                                 58                                              MEK         CH.sub.3 C(O)C.sub.2 H.sub.5                                                                    80                                              THF         cyclo-OC.sub.4 H.sub.8                                                                          66                                              methyl formate                                                                            HC(O)OCH.sub.3    32                                              ethyl formate                                                                             HC(O)OC.sub.2 H.sub.5                                                                           54                                              methyl acetate                                                                            CH.sub.3 C(O)OCH.sub.3                                                                          56                                              ethyl acetate                                                                             CH.sub.3 C(O)OC.sub.2 H.sub.5                                                                   77                                              cyclohexane                   81                                              hexane                        69                                              cyclopentane                  49                                              acetone                       56                                              1,2-dichloroethane            84                                              acetonitrile                  82                                              methylene chloride            40                                              ______________________________________                                    

Additives such as lubricants, corrosion inhibitors, stabilizers,surfactants, dyes and other appropriate materials may be added to thenovel compositions of the invention for a variety of purposes providedthey do not have an adverse influence on the composition, for theirintended applications. Examples of stabilizers include nitromethane andnitroethane.

We claim:
 1. An azeotropic or azeotrope like composition consistingessentially of 56.8 to 69.8 weight percent1,1,2,2,3,3,4,4-octafluorobutane, 27.9 to 39.9 weight percenttrans-1,2-dichloroethylene, and 1.8 to 3.8 weight percent methanol,wherein when the pressure has been adjusted to substantially atmosphericpressure, the boiling point of the composition is about 34.7° C.; 63.2to 69.2 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, 30.0 to 36.0weight percent trans-1,2-dichloroethylene, and 0.2 to 1.4 weight percentethanol, wherein when the pressure has been adjusted to substantiallyatmospheric pressure, the boiling point of the composition is about36.1° C.; 60.0 to 68.0 weight percent 1,1,2,2,3,3,4,4-octafluorobutane,31.7 to 39.7 weight percent trans-1,2-dichloro-ethylene, and 0.1 to 0.5weight percent isopropanol, wherein when the pressure has been adjustedto substantially atmospheric pressure, the boiling point of thecomposition is about 36.0° C.; 78.2 to 84.2 weight percent1,1,2,2,3,3,4,4-octafluorobutane, 12.3 to 18.3 weight percentcis-1,2-dichloroethylene, and 2.5 to 4.5 weight percent methanol,wherein when the pressure has been adjusted to substantially atmosphericpressure, the boiling point of the composition is about 40.2° C.; 72.4to85.4 weight percent 1,1,2,2,3,3,4,4,-octafluorobutane 12.7 to 26.7weight percent cis-1,2-dichloroethylene, and 0.4 to 2.4 weight percentethanol, wherein when the pressure has been adjusted to to substantiallyatmospheric pressure, the boiling point of the composition is about42.5° C.; 75.0 to 86.0 weight percent 1,1,2,2,3,3,4,4-octafluorobutane,12.5 to 23.5 weight percent cis-1,2-dichloroethylene, and 0.1 to 1.0weight percent isopropanol, wherein when the pressure has been adjustedto substantially atmospheric pressure, the boiling point of thecomposition is about 42.2° C.; 76.6 to 84.6 weight percent1,1,2,2,3,3,4,4-octafluorobutane, 14.0 to 18.0 weight percent1,1-dichloroethane, and 1.4 to 5.4 weight percent methanol, wherein whenthe pressure has been adjusted to substantially atmospheric pressure,the boiling point of the composition is about 40.3° C.; 73.5 to 82.5weight percent 1,1,2,2,3,3,4,4-octafluorobutane, 17.1 to 24.1 weightpercent 1,1-dichloroethane, and 0.4 to 2.4 weight percent ethanol,wherein when the pressure has been adjusted to substantially atmosphericpressure, the boiling point of the composition is about 39.6° C.; and77.0 to 87.0 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, 12.6 to22.6 weight percent 1,1-dichlorethane, and 0.1 to 1.0 weight percentisopropanol, wherein when the pressure has been adjusted tosubstantially atmospheric pressure, the boiling point of the compositionis about 42.6° C.
 2. The composition of claim 1, consisting essentiallyof 62.0 to 64.6 weight percent 1,1,2,2,3,3,4,4-octaflurobutane, 32.7 to35.1 weight percent trans-1,2-dichloroethylene, and 2.6 to 3.0 weightpercent methanol; 65.9 to 66.5 weight percent1,1,2,2,3,3,4,4-octafluorobutane, 32.8 to 33.2 weight percenttrans-1,2-dichloroethylene, and 0.6 to 1.0 weight percent ethanol; 63.9to 64.1 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, 35.5 to 35.9weight percent trans-1,2-dichloroethylene, and 0.2 to 0.4 weight percentisopropanol; 80.9 to 81.5 weight percent1,1,2,2,3,3,4,4-octafluorobutane, 15.0 to 15.6 weight percentcis-1,2-dichloroethylene, and 3.4 to 3.6 weight percent methanol; 77.6to 80.2 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, 18.3 to 21.1weight percent cis-1,2-dichloroethylene, and 1.2 to 1.6 weight percentethanol; 79.0 to 83.0 weight percent 1,1,2,2,3,3,4,4-octafluorobutane,17.5 to 19.5 weight percent cis-1,2-dichloroethylene, and 0.2 to 0.4weight percent isopropanol; 80.2 to 81.0 weight percent1,1,2,2,3,3,4,4-octafluorobutane, about 15.8 to 16.2 weight percent1,1-dichloroethane, and about 3.2 to 3.6 weight percent methanol; 77.1to 78.9 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, 19.9 to 21.3weight percent 1,1-dichloroethane, and 1.2 to 1.6 weight percentethanol; and 81.9 to 82.1 weight percent1,1,2,2,3,3,4,4-octafluorobutane, 17.5 to 17.7 weight percent1,1-dichloroethane, and 0.2 to 0.6 weight percent isopropanol.
 3. Thecomposition of claim 1, consisting essentially of about 63.3 weightpercent 1,1,2,2,3,3,4,4-octafluorobutane, about 33.9 weight percenttrans-1,2-dichloroethylene, and about 2.8 weight percent methanol; about66.2 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, about 33.1 weightpercent trans-1,2-dichloroethylene, and about 0.7 weight percentethanol; about 64.0 weight percent 1,1,2,2,3,3,4,4-octafluorobutane,about 35.7 weight percent trans-1,2-dichloroethylene, and about 0.3weight percent isopropanol; of about 81.2 weight percent1,1,2,2,3,3,4,4-octafluorobutane, about 15.3 weight percentcis-1,2-dichloroethylene, and about 3.5 weight percent methanol; about78.9 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, about 19.7 weightpercent cis-1,2-dichloroethylene, and about 1.4 weight percent ethanol;about 81.0 weight percent 1,1,2,2,3,3,4,4-octafluorobutane, about 18.6weight percent cis-1,2-dichloroethylene, and about 0.4 weight percentisopropanol; about 80.6 weight percent 1,1,2,2,3,3,4,4-octafluorobutane,about 16.0 weight percent 1,1-dichloroethane, and about 3.4 weightpercent methanol; about 78.1 weight percent1,1,2,2,3,3,4,4-octafluorobutane, about 20.6 weight percent1,1-dichloroethane, and about 1.4 weight percent ethanol; and about 82.0weight percent 1,1,2,2,3,3,4,4-octafluorobutane, about 17.6 weightpercent 1,1-dichloroethane, and about 0.4 weight percent isopropanol. 4.A process for cleaning a solid surface comprising treating said surfacewith a composition of any of claims 1 through
 3. 5. A process forproducing refrigeration, comprising condensing a composition of any ofclaims 1 through 3, and thereafter evaporating said composition in thevicinity of a body to be cooled.